Multiple and non-planar crack propagation analyses in thin structures using FCPAS

Abstract

In this study, multiple and non-planar crack propagation analyses are performed using Fracture and Crack Propagation Analysis System (FCPAS). In an effort to apply and validate FCPAS procedures for multiple and non-planar crack propagation analyses, various problems are solved and the results are compared with data available in the literature. The method makes use of finite elements, specifically three-dimensional enriched elements to compute stress intensity factors (SIFs) without special meshing requirements. A fatigue crack propagation criterion, such as Paris-Erdoğan equation, is also used along with stress intensity factors to conduct the simulation. Finite element models are generated within ANSYS™ software, converted into and solved in FRAC3D program, which employs enriched crack tip elements. Having computed the SIFs for a given crack growth increment and using a growth criterion, the next incremental crack path is predicted and the fracture model is updated to reflect the non-planar crack growth. This procedure is repeated until cracks reach a desired length or when SIFs exceed the fracture toughness of the material. It is shown that FCPAS results are in good agreement with literature data in terms of SIFs, crack paths and crack growth life of the structure. Thus, accuracy and reliability of FCPAS software for multiple and non-planar crack propagation in thin structures is proven.

Variation in Crack Growth Properties and Its Effect on Fatigue Crack Growth Life for Al 7075-T6

“…Further information about FCPAS and enriched elements can be found in previous studies. Three-dimensional fracture mechanics problems such as interfacial cracks [17], mixed mode fracture [18], functionally graded materials [19] and multiple cracks [20] have been solved accurately and efficiently using FCPAS.…”

Crack Initiation Criteria and Fracture Simulation for Precracked Sandstones

“…e PFC2D software has been employed to discuss the effect of the initial flaw orientation in the specimen's failure mode under compressive loading [29]. A fracture and crack propagation analysis system has been employed in the investigation of crack growth [30]. e maximum tangential stress [31], maximum energy release rate [32], and minimum energy density criterion [33,34] have typically been considered as the fracture initiation criteria to identify the crack growth mechanism of brittle rocks.…”